My roosters do NOT go to bed if all their hens aren't in. They stay and crow and crow to call the last ones in, but they do NOT....ever....go to bed when there is a down number. Not sure they can add and subtract, but they know their flock and a good roo will put his life out on the line for his flock. We had a hawk fly over and he gave the call and all the hens scattered into the barn or under shrubs, but he stood in the center of the drive and just looked up. I was impressed how much they care and look out for their flock.